/**
 * Copyright (C) 2008 aileron.cc
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package cc.aileron.commons.accessor;

import java.util.ArrayList;
import java.util.Map;
import java.util.Map.Entry;

/**
 * helper
 * 
 * @author Aileron
 * 
 */
public class PojoAccessorHelper
{
    /**
     * map を pojo に設定します
     * 
     * @param accessor
     * @param map
     */
    @SuppressWarnings("unchecked")
    public static void setToMap(final PojoAccessor<?> accessor,
            final Map<String, Object> map)
    {
        for (final Entry<String, Object> ent : map.entrySet())
        {
            final String key = ent.getKey();
            final Object val = ent.getValue();

            /*
             * 　value が配列で無い場合
             */
            if (!ArrayList.class.isAssignableFrom(val.getClass()))
            {
                accessor.set(key, val);
                continue;
            }

            /*
             * value が配列の場合 lngth が 1 の場合のみ、最初の値を使用する
             */
            final ArrayList<Object> array = (ArrayList<Object>) val;
            switch (array.size())
            {
            case 0:
                accessor.set(key, null);
                break;

            case 1:
                accessor.set(key, array.get(0));
                break;

            default:
                accessor.set(key, array);
                break;
            }
        }
    }

    /**
     * private constractor
     */
    private PojoAccessorHelper()
    {
    }
}